AR-15 .350 Legend 18" Midlength Upper Assembly | 15" Free Float Rail | Enhanced Performance Upper

Product Code:MAR-350-18-NTR-A2
Availability:In Stock
  • $299.95

  • $499.95

Available Options

.350 Legend

AR-15 .350 Legend 18" Midlength Upper Assembly | 15" Free Float Rail | Enhanced Performance Upper

Upgrade your AR-15 with the .350 Legend 18" Midlength Upper Assembly featuring a 15" Free Float Rail, designed for shooters who demand superior performance and precision. The .350 Legend offers a significant velocity and energy boost, without the need for a specialty bolt, making it an excellent choice for hunters, tactical shooters, and those seeking more power from their standard AR-15 platform.


Key Features:

  • Barrel Length: 18" for optimal balance and range, designed to maximize the potential of the .350 Legend cartridge.

  • Gas System: Midlength gas system, offering smooth cycling and reduced recoil for improved accuracy and follow-up shots.

  • Barrel Profile: M4 Contour for excellent handling and a solid shooting experience.

  • Barrel Steel: 4150 CMV for enhanced strength, durability, and resistance to wear, making it ready for long-lasting use.

  • Barrel Finish: Parkerized finish for corrosion resistance and durability.

  • Twist Rate: 1:16 twist rate for accurate stabilization of .350 Legend rounds.

  • Muzzle Thread: 5/8x24, compatible with most muzzle devices such as flash hiders, compensators, or brakes.

  • Gas Block: .750 low profile steel gas block, ensuring a stable and efficient gas system.

  • Muzzle Device: Includes A2 Flash Hider for flash reduction and recoil management.

  • Receiver Material: Constructed from 7075-T6 Aluminum forging for lightweight strength and durability.

  • Handguard Type: 15" Free Float Slim Rail made from high-quality aluminum with a hardcoat anodized finish for a secure, customizable platform.


Detailed Breakdown:

  • Barrel: The 18" 4150 CMV parkerized barrel is chambered in .350 Legend, offering the perfect combination of power and accuracy. The 1:16" twist ensures precision, and the mid-length gas system helps in reducing recoil and improving the cycling of your firearm.

  • Upper Receiver: Made from 7075-T6 aluminum forging, this A3 flat top upper receiver is built to withstand heavy use. It features black hardcoat anodizing for increased durability, and includes a forward assist and ejection port cover for proper functionality.

  • Handguard: The 15" Free Float Slim Rail allows for optimal customization, making it easy to attach accessories like grips, lights, and lasers. Its lightweight design adds to the overall handling performance.

  • Assembly Ready: Comes fully assembled and ready to mount to your AR-15 lower receiver. BCG and charging handle are not included.


Additional Notes:

  • This upper assembly is perfect for those looking to boost their AR-15's performance with the .350 Legend cartridge, providing more power and energy without the need for a specialty bolt.
  • Does not include BCG or charging handle (sold separately).
  • The 15" Free Float Rail allows for easy customization, and its slim design is great for tactical use, offering a solid and secure mounting platform for accessories.
  • Images may not be the exact representation of the product.
Dean M 06/13/2021

Upper looks good. No problems cycling. Only small complaints is the fee float forend screws were not tight. Looks good shoots good.

Robert 06/05/2021

I am impressed with the fit and finish of this upper. Rifle shot 5/8 inch three shot groups back to back. . 2.25 inch at 200. Way better than I expected. Keep up the good work

Kevin W 11/09/2020

11/9/20 Update (to my initial 10/23/20 review):

This complete upper is fantastic. It’s a joy to shoot and looks just as nice. Absolutely a masterpiece for the price - you won't be disappointed! You can officially stop reading and purchase now!

I initially had feeding issues even when cycling by hand (bolt wouldn't quite get to battery and was too far out to use FA yet). After some research I discovered this is a common issue for the duramags (Ruger reboxes duramag). I cut down the front wall of my 5rd mag (for IA deer) to about twice as much. Sighting in my scope, every fmj fed flawlessly and was accurate. The feed ramps on the upper I received were perfect and had zero burrs or defects. I can almost bet that 95+% of the issues out there for this cartridge are magazine related or was a knock off company that used the wrong feed ramps. Rest assured that Moriarti uses 300 blackout ramps that are flawless and work as you would expect! Moriarti has gained another lifetime customer!

Kevin W 10/23/2020

I also received mine about a month after ordering. I finally had time last night to fit it up to my existing lower. Installed my current bcg and made sure it engaged fully before installing the charging handle. I do not have head space gauges but it appeared everything was in check. Checked the takedown pins and they were easy to push/pull out yet the fit was just right snug. This upper looks beautiful and I was suprised that it feels lighter than my 5.56 16" upper.

I have a few more things I want to check over on it yet before sending rounds down it, but I do not have any doubts, and the fit/finish is worth your wait! It was hard for me to be patient, but after holding it and assembling it, it was well worth it. Excited to get it to the range and for deer season this year in IA! For reference, mine came with a plain dust port cover, but since its my hunting gun, that's all it needs - but the other one sounds like it would look really cool!

Matt F 10/02/2020

Wow! Amazing fit and finish. The black on the upper matched my lower perfectly. Have shot it yet. Will update when I do.

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Tags: ar-15, .350, legend, 18", midlength, upper, assembly, 15", free, float, rail, enhanced, performance 18", 15" 18", 15"

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